ppt source code：
src.zip (3.3 KB)
origin ppt files:
ppt.zip (3.1 MB)
converted problem:
convert error.jpg (245.4 KB)
Please have a check.
I have observe the information shared by you and unable to understand what issue is incurring on your end. Can you please try using latest Aspose.Slides for Java 20.4 on your end and share the details of issue incurring on your end. Moreover, in your presentation files, I am unable to open one with 2 MB size even in PowerPoint. Secondly, in your sample code, you are loading custom fonts as well. Please do share the used fonts as well.